Process and device for the measuring of rotational velocities



Jan. 15, 1952 w, wAHLl 2,582,727

PROCESS AND DEVICE FOR THE MEASURING 0F ROTATIONAL VELOCITIES Filed Dec. 27, 1946 2 SHEETS-SHEET l WERNE WAHL' INVENTOR RA ATTORNEY Jan. 15, 1952 wA 2,582,727

W. PROCESS AND DEVICE FOR THE MEASURING OF ROTATIONAL .VELOCITIES Filed Dec. 27, 1946 2 SHEETS-SHEET 2 Pferii er Wak Z4 Wim Patented Jan. 15, 1952 PROCESS AND DEVICE FOR THE MEASUR- lNG ROTATIONAL VELOCITIES Werner Wahli, Berne-Bumpliz, Switzerland Application December 27, 1946, Serial No. 718,836

' The present invention relates to the measurement of rotational velocities. V

The object of the present invention is a process for the measurement of rotational velocities by means of a fluid pump driven at the speed re- 6 quiring to be measured, in which process quantities delivered by the pump in cyclically successive periods of equal duration are each segregated for the purpose of bein measured separately.

The momentary quantity delivered by the fluid pump stands in proportional relationship to the momentary driving speed of the pump, which driving speed it is desired to measure. Thus each and every one of these segregated quantities delivered is in the process forming the object of the present invention a quantity proportional to the mean driving speed of the pump over the relevant period of time, which driving speed it is required to ascertain.

As a device for carrying out the said process which forms the object offthe'jinvention there may be provided as minima one measuring chamher for the fluid delivered by the pump, which latter is drivenat the rotational speed requiring to be measured, and a control organ located on the delivery line between the pump and the measurin chamber and suitably arranged for fulfilling at least two functions in relation to each measuring chamber, by means of which control organ, in the performance of one of its functions,

the fluid pumped is supplied to the measuring chamber, whilst in the performance of the other function the fluid pumped is evacuated from said measuring chamber.

The control organ can moreover be so designed contained in the measuring chamber is confined 0 therein. The device may, in order to provide a velocity meter of practical efliciency, be provided by way of example, with three measuring chambers.

'Further objects and details of the invention will be' apparent from the description given hereinafter and the accompanying drawings illustrating an embodiment thereof by way of example. In the drawing,

- Fig. 1 is a diagrammatical illustration of a device according to the invention, 3

Fig. 1a is a 'diagrammatical illustration of another type of pump useful with the device,

Fig. 2 is a diagrammatical illustration of part Fi g'flarandof the device of Fig. 1 with pumps according to u In Switzerland January 19, 1946 18 Claims. (01. 264-1) z Fig. 3 is a diagram showing the control element in three different positions.

The shaft l drives, in the rotational direction indicated by the arrow, a fluid pump 2, which may by way of example take the form of a gear pump, which pump conveys from the container 3 through the suction pipe 4 and through the pressure pipe 5 into the distributing device 6 a quantity of fluid proportionate to the rotationalspeed of the pump. This controlling or distributing device 6 has a rotary valve body 8 driven by means of a shaft I in the direction indicated by the arrow and located in an annular housing 9 fitted with three outlet ports 10 arranged at an angle of each to the other, each of which outlet ports communicates through a connecting pipe with its particular measuring chamber l2. The fluid delivered passes through the pressure pipe 5, in Fig. 1 from the front end, into a central bore I3 of the valve body 8 and thence through a radial bore 14 in the same, through the outlet port III of the valve" housing 9 and through the connecting pipe I"! into the relevant measuring chamber l2. All three measuring chambers 12 preferably take the form of cylindrical cavities of like dimensions; in each of which a measuring plunger IS with a plunger-rod l6 projecting from the cylinder is arranged in such manner that it can be displaced and is subject to the action of a spiralspring H, which latter tends to force the plunger into the zero position, the latter being, in Fig. 1, the cylinder end adjacent to the control valve. The cylinders l2 are arranged each parallel to the others in a common housin I8. That end of each plunger-rod l6 opposite to that carrying the measuring plunger acts in an axial direction on a plate 20 common to all the plunger-rods which is so disposed in the guides l9 as to be capable of movement in the said axial direction, and which is kept in contact, by means of a spiral spring 2!, with that plunger rod l6 which at any given moment projects farthest from the housing I8. The plate 20 bears, arranged in the direction of its motion, a rack 22 which engages with a pinion 25 mounted on the 'axle 23 of the pointer of an indicating device 24 and transmits the motion of the plate Zll to the pointer 26 of the indicating device 24. The plate may alternatively be fitted with a stylus 21 which traces the motions on a recording strip in the known manner.

In order to avoid damage to the velocity met-er should its range of measurement be exceeded, an overflow port 28 is arranged in each cylinder l2 at that poin'tin the stroke of the plunger which ber l2.

pump 2 delivers to the measuring chamber 12a.

is mai ained ationar n e s ng .p iistages arelmadeiequal astu duration' then atany isdependent itheon mt on o thero ary valve tr corresponds to the limit of measurement, this overflow port leading into the container 3.

The rotary valve body 8 is provided with a recess 29 arranged at an angle of 120 to the radial bore I4, through which recess the fluid expelled by the plunger on its return, propelled by the sp in to z ro posit on, passes o n o t e container 3, V

The cycle of operations of each single measuring chamber I2 is as follows: in an initial p-; erative position, maintained for a relatively short period of, for example, half a secong lf offih j ifll aly valve body 8 the radial bore [4 of thelattercoincides with the part I0 and connecting pigg provided for the particular measuring cham- During this predetermined period of tim'e the quantity of fluid proportionate to the average ee d o t e i-fri ns. sha t l or the sa in er-va of time, this resulting in the. measuring pl iil'ge r i5 being forced from its zeropositi'on to. ameas uring point. corresponding to. the quantity, of fluid h ohT e en e ed he c li der. he easu in Point reached by the. plunger '15 consequently yields n r p t o t e said mea locity. quantity measurement which, through the inter median? of the transmitting and-indicating de- 1 vices "endow e eadion a e Ou ermination of; the periodof timeduring; which the rotary valve body remains in its first operative" position. the, valve. rotated, preferably by a sudden jferl; or step athigh. speed, in the rota! tional direction indicated; by the arrow, to theex tentof 120?,unti1fit assumes asecond operative i-ifi position inwhichit closes the port. l0 and, .'in con-. sequence, the connecting-pipe 'l I. and the measuri ng chamber 12,. Throughthis the plung r, 15

tion tor the P r od iillij ii which theiota'ryi' valv 40 od r m econd tinotat a no i-' 1 tion; At the terminationof this second period" e f he raiii ro ati nof the t ry el' bodv y 29 in he ro tio d e t o i d et d yto'e h d ation l. sit on, akes lac he form, of 'asudden jerk,fthroug h. whichmotion the. recess 29 onthevalvefb-Qd 8 comes intov corn- .munication with the port to, so that as. a result.

of the return stroke of the plunger 15, operated by the spring. IT, to. take'up its; zero position 1 1" mg a third fperi'od', the quantity'of fluid corresponding to; the plunger stroke is egpielledinto the container 3. On termination of the third period the cycle of three operations can; 'recom-' men-Ce; v In the typicalembodiment of the device three measuring chambers I? are provided, to 'allof" which is-allocated one and the same rotary-valve 8* as a "distributing-organ; The-operational steps i that when the velocity meter is in operation if the periodstoccupied by theindividual stepsgor givenmoment. one measuring chamber at the.

stage offfiuid-intake orlfilling, one atthestage.

of confinement andone atthe evacuating stage; There. thus takes place; a cycleof processes whicm The operation of the valve is provided iorby. a;,

iookw rkmeohe i in throu h themed e i o en s e ement: w .ieh. clockwork.me banismea i nila r ie these .iee m et d. vel. ieteis YZQIZEZQE; 92h mitalv e igeie.

j-fiael'oeitv".

-capacii'ayof 'the pump to be made variable within x vari In order to vary the measuring range of the er'= -it;isalso possible for the delivery instance by using a rotary pump of variable eccentricity. A pump of such -typ i-isdiagrammatically illustrated in Fig. 1a where'inthe pump housing 33 can be adjusted as its; eccentricity with respect to the pump rotor 32 by means of the screw 34. Fig. 2 showsthree li h pumps. 35 i613. and .3511? conneetedb condu'i s 3 a 3C toimeesuring. chamb s 35A. 7

1.3 and 5. 1 respectively, A co trol. devicev 3 r n. h h c ockwor 8 ommon to he h e pum s, i -J3 shows. r e difi rent p stiens o the control elemen relati n o he. endiiite'tafifiandi In. e,- 3 he. po ti n:

of hefeontrolj'el ment;3min relation o con uit 3A is such. th t. the radialidue 'tfl commu cates wi h con ui s 3A so het fluid can. pass o the on ec ed hamber. 35A 1111c. outle recess 40 d o nn otedf om-con ui A A th some tim h p s i n the contro element is that marked n etion' o the. conduit 31 wher both u t 39 -a d he reeess ll' disconnecte ro h ond it- Also at: the same. time the con r l element s in h noei iontlc in. re ati n o con-- dui't 3Cso. hattbe fluidt anbe dieeliare 'di om chamber 35C through'the recessjll.v Fig. 3b; shows he. on rol em nt..tu neel. 12 n thi s ioilr iiot '39 a cl'. r cess; so; are disconn cted;

. fiQwillihediohar edas e recess- 0 re ister with con uit 3B.1wher. as chamber -56" ill eoihargedlame. e.,.ie. at .4 from ..-the1 position "of-Big 3 chamber. 5'A1wi 1. be dis.-

hetgea, hamber 353 will be charged; and h mber. 5C. s di connected; n all oth repectshe. modified ev oeoirigs. 2 and 3 iss mir lar toth'efdevioe QfEigilt.

Lossesthrough. leakage in. the d livery, is.- ribut'orr. a d mea u ing or a s can be allo ed r on or i stances calib ating. ccordi gly the ale on the. ind cating. devi e. e enii. inn aoti'oe such'losss are negligible.

Q .p ii e zv moort ne i he. measur m nto peeds... in part cu a the. con tant m asurement. erei re whom for. insta ce-wh y reloeing. recorded, erectil qu nti ie of fluiddel v eii y he fi iid some i successi e. periods o equal d rat on o; m asu ing ch mbers invol ed. at

n si enmo ient T e be iodsof tim t lis d o ose op rational pro to ses which co s st. in heolosure; of and the e acua on 0f, the measurin chambers do not of necessity have to coincide.

.. with:,those al otted to the eliv rv of th ttiuidg. o

s, sinoe' io th s p r ose. cons rue..- oatioiieto heiie ee des ribed as a ypical... mbodime tax rea ly e-v ima ined" It is also possible to have more than. one iluid puma, each. be ng, rovided wi ha e s on measuring chamber, ,tl 1 e, individual fill g. 91 0c: sse of el themeaeurioschamb rs u c din each othe pe io any, t whol bei g com on di tribu ing or a c mmon chambe -t l iiiinvenutn has been described with.

5, respect to a somewhat schematic embodiment, it will be understood by those skilled in the' art, after understanding the invention, that various forms of constructions may be made without departing from the spirit and scope of the invention, and it is intended, therefore, in the appended claims to cover all such forms of construction.

What I claim is:

1. A process for measuring rotational velocitiescomprising the steps of driving a fluid pump at the speed to be measured, segregating quantities of fluid delivered by the pump in cyclically successive periods of predetermined duration, and measuring the quantities separately.

2. A process for measuring rotational velocities comprising the steps of driving a fluid pump at the speed to be measured, segregating quantities of fluid delivered by the pump in cyclically successive periods of predetermined duration, adjusted according to the range of speeds to be measured, and measuring the quantities separately.

3. A process for measuring rotational velocitiescomprising the steps of driving a fluid pump at the speed to be measured, segregating quantities of fluid delivered by the pump in cyclically suc-' cessive periods of predetermined duration, adjusting the delivering capacity of the pump and measuring the quantities separately.

4. A device for the measurement of rotational velocities, comprising a fluid pump adapted to be driven at the rotational speed to be measured, a measuring chamber for fluid delivered by said pump and a control element, disposed between said pump and said measuring chamber, and adapted for the performance of two functions in the course of the performance of one of these functions pumped fluid is supplied to the measuring chamber and in the course of the performance of the other function pumped fluid is evacuated therefrom.

5. A device as claimed in claim 4, said control element being adapted for performing a third function which follows the first-named function, in the course of which third function the quantity of fluid contained in the measuring chamber at the end of the first function is confined therein.

6. A device for the measurement of rotational velocities comprising a fluid pump adapted to be driven at the rotational speed to be measured, a plurality of measuring chambers, a delivery line connecting said pump to said chambers, a control element disposed in said line between said pump and each of said chambers and adapted for the performance, in respect of each of said measuring chambers, of two functions, in the course of the performance of one of these functions pumped fluid is supplied to said measuring chamber and in the course of the performance of the other function pumped fluid is evacuated therefrom.

'7. A device as claimed in claim 6, the control element being adapted to cyclically connect each of said measuring chambers in turn with the delivery side of the pump, to shut said chamber off therefrom, and to open said chamber for evacuation purposes.

8. A device for the. measurement of rotational velocities, comprising a fluid pump adapted to be driven at the rotational speed to be measured, a measuring chamber for fluid delivered by said pump, and a rotary valve, disposed between said pump and said measuring chamber, and adapted for the performance of two functions, in the courseof the performance of one of these functions pumped fluid is supplied to the measuring chamber-and in the course of the performance of the other function pumped fluid is evacuated therefrom.

9. A device for the measurement of rotational velocities comprising a fluid pump adapted to be driven at the rotational speed to be measured, a plurality of measuring chambers, a delivery line connecting said pump to said chambers, a rotary valve disposed in said line between said pump and each of said chambers and adapted for the performance, in respect of'each of said measuring chambers, of two functions, in the course of the performance of one of these functions pumped fluid is s pplied to said measuring chamber and in the course of the performance of the other function pumped fluid is evacuated there- 10, A device for the measurement of rotational velocities, comprising a fluid pump adapted to be driven at the rotational speed to be measured, a measuring cylinder, a plunger movably disposed in said cylinder, and a control element, disposed between said pump and said measuring cylinder, and adapted for the performance of two functions,. in the course of the performance of one of these functions pumped fluid is supplied to the measuring cylinder and in the course of the performance of the other function pumped fluid is evacuated therefrom.

11. A device for the measurement of rotational velocities, comprising a fluid pump adapted to be driven at the rotational speed to be measured, a measuring cylinder, a plunger movably disposed in said cylinder, and a rotary valve disposed between said pump and said measuring cylinder, and adapted for the performance of two functions, in the course of performance of one of these functions pumped fluid is supplied to the measuring cylinder, and in the course of the performance of the other function pumped fluid is evacuated therefrom.

12.- A device for the measurement of rotational velocities, comprising a fluid pump adapted to be driven at the rotational speed to be measured, a plurality of measuring cylinders, plungers movably disposed, respectively, in said cylinders, a

delivery line connecting said pump to said cylinders, a control element disposed in said line between said pump and each of said cylinders, and adapted for the performance, in respect of each of said measuring cylinders, of two functions, in the course of the performance of one of these functions pumped fluid is supplied to said cylinders and in the course of the performance of the other function pumped fluid is evacuated therefrom.

13. A device for the measurement of rotational velocities, comprising a fluid pump adapted to be driven at the rotational speed to be measuerd, a plurality of measuring cylinders, plungers movably disposed, respectively, in said cylinders, a delivery line connecting said pump to said cylinders, a rotary valve disposed in said line between said pump and each of said cylinders, and adapted for the performance, in respect of each of said measuring cylinders, of two functions, in the course of the performance of one of these functions pumped fluid is supplied to said cylin-, ders, and in the course of the performance of the other function pumped fluid is evacuated therefrom.

14. A device for the measurement of rotational u velocities, comprising a fluid pump adapted to be driven at. the rotational. speed to-be measured...

velocities comprising, a; fluid pump adapted. tQQbe' drivenv at. the rotational speed tol'be. measured, means for adjusting, the. delivery capacity of. said.

pump; a. plurality of measuring chambers. a

delivery line connecting ,said pump to. said bers, a control element disposed in said line; between said pump and each. of said. chambers and adapted for the performance, inrespect. of each. of saidmeasuringchambers,v of two tune.- tions, in the course, of the. performance of. one: of these functions pumped fluid is. supplied to said measuring chamber andin the courseof the performance of. the other function pumped fluid is evacuated therefrom.

16. A device for the measurementof rotational.

velocities comprising a plurality of. fluid. pumps each adapted to be driven at. the rotationalspeedto be'measu'red, a plurality of measuring chamery lines connecting, respectively, said pumpsto.

saidchambers, and a common control element adapted for' the performance, in respect of each of said measuring chambers, of twov functions, in the course of the performance of one of. these' functions pumped fluid issupplied. to saidmeasuring chamber and inJthe courseofithe performanceof the other function pumped fluid is evacuated therefrom.

17'; A device for the. measurement. of rotational.

hers, at. least one for each of. saidpumps, deliv- V ahead velocitiescmnprisingl a rotary fluid; pump, ameasurine. means adapted. tor-receive. fluid. from said.

. ative. incyclesof predetermined length to. admit fluid from. said pump to said. means; during one partsof. each cycle and to drain the admitted fluid during another part Of each cycle, said means,

including a member responsive to and indicative of. the quantity of fluid. delivered: by said pump to. said means'per each of said cyclesas ameasure of. the rotary speed at. which said. pump is driven.

18 A device. for the. measurement. of rotational velocities. comprising, afluid pump adapted to be driven at the. rotationalspeedto be:measured, achambe1:,, aconduit. between said pump andsaid chamber, a. drain for said. chamber; a cyclically operative. control device. in said conduit, said device. including a. first means. for opening the passage of fluid through said conduit during, a first partof a cycle of said device and a. second means to. closesaid passage andto connect said chamber to said drain during another part-of said cycle, and third means in connection with said chamber to indicate the: quantity of fluid pumped intov said chamber. during said first. part,

of said cycle.

' WERNER-WAHLI.

REFERENCES. CITED The: following, references: are: of record in. the file of thiszpatentl.

UNITED STATES PATENTS Number. I Name Date.

13,732 I V Krauser et. al Nov.-13, 1855 $39,347: Quinn uu; -Mar. 5,1901 1,347,276. Johnson July 20,1920. 1,455,832 Church May 22, 1923 1,822,667 Proell Sept. 8, 1931 2321841 Nallinger Jan. 7, 1941 

